Utility knife



FIG. 1 is a front elevation view of a utility knife, showing my newdesign;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a rear elevation view thereof; and

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a bottom plan view of the utility knife of FIG. 1.

The broken lines illustrate portions of the utility knife that form nopart of the claimed design.

CLAIM The ornamental design for a utility knife, as shown and described.